Differential Revision: https://phabricator.services.mozilla.com/D179909

Even though there's some implementation work left before it being in a
shippable state, the bits that do work (which is quite a few) should
work reliably and performantly.

Given this is (afaict) the first implementation of the new spec, I want
to let people test it easier, specially since there are some questions
about error recovery that nesting could change.

Differential Revision: https://phabricator.services.mozilla.com/D179271

Backed out changeset 7bc8c25b2935 (bug 1833244)
Backed out changeset 4576af83a4ec (bug 1833244)
Backed out changeset 90a5bbba7b9c (bug 1833244)

This disables the pref for now so that the following patch doesn't change any
behavior. We'll re-enable the pref shortly.

Differential Revision: https://phabricator.services.mozilla.com/D179858

Bug 1824613 - Convert consumers of toolkit/mozapps/extensions/ to import ES modules directly. r=extension-reviewers,settings-reviewers,application-update-reviewers,credential-management-reviewers,devtools-reviewers,sync-reviewers,sgalich,bytesized,robwu,skhamis

Depends on D179819

Differential Revision: https://phabricator.services.mozilla.com/D179820

Bug 1836377 - Restore permission-based exposure of camera/microphone device labels when media.devices.enumerate.legacy.enabled is true. r=karlt

Differential Revision: https://phabricator.services.mozilla.com/D179730

Differential Revision: https://phabricator.services.mozilla.com/D179753

Backed out changeset cbef096ccab3 (bug 1836377) for causing mochitest-media failures on test_enumerateDevices.html. CLOSED TREE

Bug 1836377 - Restore permission-based exposure of camera/microphone device labels when media.devices.enumerate.legacy.enabled is true. r=karlt

Differential Revision: https://phabricator.services.mozilla.com/D179730

Differential Revision: https://phabricator.services.mozilla.com/D179829

Bug 1836255 - Set network.early-hints.preconnect.max_connections to 10 also in non-nightly channels r=necko-reviewers,jesup

This is fine to be always non-zero, because the variable is only read if
network.early-hints.preconnect.preconnect is set to true

Differential Revision: https://phabricator.services.mozilla.com/D179684

Differential Revision: https://phabricator.services.mozilla.com/D179456

Depends on D179337

Differential Revision: https://phabricator.services.mozilla.com/D179420

Enable wheel event groups by default on early beta.

Differential Revision: https://phabricator.services.mozilla.com/D179746

Since the headless work (bug 1129492 and co) we realistically have no
way of rendering native scrollbars in any meaningful way. Remove dead
code that used to support using a different GTK theme on content.

Differential Revision: https://phabricator.services.mozilla.com/D179616

This API has been disabled on nightly and early beta for a long time.
We have kept the API available in release in order to avoid
triggering any bugs in webapps that assume the API is there, but the
cache backing has been removed a few years back.

Considering this has also been removed in Chrome, it's quite safe
to disable and completely remove it from Firefox.

Differential Revision: https://phabricator.services.mozilla.com/D179337

Backed out changeset 2b6b58a6fe2f (bug 1677718)
Backed out changeset d1cfc37a01b3 (bug 1677718)

Depends on D176858

Differential Revision: https://phabricator.services.mozilla.com/D176859

Differential Revision: https://phabricator.services.mozilla.com/D178593

Backed out 19 changesets (bug 1830790) for causing failures on test_peerConnection_extmapRenegotiation.html. CLOSED TREE

Backed out changeset db4607bbd6d1 (bug 1830790)
Backed out changeset f40f865d0542 (bug 1830790)
Backed out changeset a855ea2a86ce (bug 1830790)
Backed out changeset f8ab14e89266 (bug 1830790)
Backed out changeset c234e91383df (bug 1830790)
Backed out changeset f460416a4c52 (bug 1830790)
Backed out changeset 53848fcc501f (bug 1830790)
Backed out changeset 31754aa2ac82 (bug 1830790)
Backed out changeset 994a28147fd3 (bug 1830790)
Backed out changeset cfb3a9040263 (bug 1830790)
Backed out changeset 416dc905b314 (bug 1830790)
Backed out changeset 8867c53e1827 (bug 1830790)
Backed out changeset 5885fd524e71 (bug 1830790)
Backed out changeset a1185664d37a (bug 1830790)
Backed out changeset 95473364c681 (bug 1830790)
Backed out changeset 85e101a4ff1a (bug 1830790)
Backed out changeset 6fd62bd98d73 (bug 1830790)
Backed out changeset a3d1461f8928 (bug 1830790)
Backed out changeset fcb4c264369e (bug 1830790)

Bug 1704521 - [devtools] Add a preference to disable the F12 shortcut r=devtools-reviewers,fluent-reviewers,nchevobbe,flod

Depends on D143835

Differential Revision: https://phabricator.services.mozilla.com/D179463

Depends on D143833

Differential Revision: https://phabricator.services.mozilla.com/D143835

Differential Revision: https://phabricator.services.mozilla.com/D179456

Differential Revision: https://phabricator.services.mozilla.com/D179300

Depends on D176858

Differential Revision: https://phabricator.services.mozilla.com/D176859

Depends on D179337

Differential Revision: https://phabricator.services.mozilla.com/D179420

This API has been disabled on nightly and early beta for a long time.
We have kept the API available in release in order to avoid
triggering any bugs in webapps that assume the API is there, but the
cache backing has been removed a few years back.

Considering this has also been removed in Chrome, it's quite safe
to disable and completely remove it from Firefox.

Differential Revision: https://phabricator.services.mozilla.com/D179337

Bug 1811321 - Create PiP panel for disablePiP. r=pip-reviewers,fluent-reviewers,desktop-theme-reviewers,flod,dao,kpatenio

Differential Revision: https://phabricator.services.mozilla.com/D175048

Bug 1704954 disabled DirectComposition for users with NVIDIA graphics
hardware and mixed monitor refresh rates on Windows 10 and 11, as a
mitigation for bug 1638709. However, that bug is almost -- perhaps
entirely -- unknown on Windows 11 (q.v. for details), and the fallback
path it uses has been shown to cause issues there (bug 1763981).

Restrict the mitigation to only occur on Windows 10, where bug 1638709
is exhibited, but where no issues with the fallback path are known.

This also effectively reverts bug 1816001, which it obviates.

Differential Revision: https://phabricator.services.mozilla.com/D178848

Bug 1833758 - Add a pref not to reset max consecutive adjustment count during running APZ async scroll. r=emilio

With this pref we can avoid bug 1561450 without disabling any scroll adjustments
in scroll event handlers because in the specific case of the bug the scroll
adjustment in question is zero length such as

```
  element.style.display = "block";
  element.offsetTop // flush layout
  element.style.display = "none";
```

so it can be caught by our existing consecutive adjustment heuristic. Thus with
the default layout.css.scroll-anchoring.max-consecutive-adjustments value, as of
now it's 10, the case of bug 1561450 will stop firing scroll events after
5 (= 10/2) additional scroll event observations.

Differential Revision: https://phabricator.services.mozilla.com/D178898

Differential Revision: https://phabricator.services.mozilla.com/D178461

Backed out 9 changesets (bug 1831963, bug 1821038) for causing mochitests failures in browser_preferences_usage.js. CLOSED TREE

Backed out changeset 8e03224a019c (bug 1821038)
Backed out changeset 2b8bba99a0df (bug 1831963)
Backed out changeset 44cd611f57ce (bug 1831963)
Backed out changeset 5b15a7632c91 (bug 1831963)
Backed out changeset 522ef5669a6b (bug 1831963)
Backed out changeset f730091705fd (bug 1831963)
Backed out changeset 493c07c8a519 (bug 1831963)
Backed out changeset c4811197740c (bug 1831963)
Backed out changeset baaaaff4b660 (bug 1831963)

Differential Revision: https://phabricator.services.mozilla.com/D178461

Differential Revision: https://phabricator.services.mozilla.com/D179287

Backed out 19 changesets (bug 1830790) for mda failures on test_peerConnection_extmapRenegotiation.html and test_peerConnection_constructedStream.html . CLOSED TREE

Backed out changeset 6bba4358fd61 (bug 1830790)
Backed out changeset 78d17b4c904f (bug 1830790)
Backed out changeset b58ac93a466e (bug 1830790)
Backed out changeset fe902e60fec3 (bug 1830790)
Backed out changeset 212014a98617 (bug 1830790)
Backed out changeset 12d356a551fb (bug 1830790)
Backed out changeset 6ebddf918336 (bug 1830790)
Backed out changeset 0b361ee1fac2 (bug 1830790)
Backed out changeset 84935d63f443 (bug 1830790)
Backed out changeset bbd662a6d4f9 (bug 1830790)
Backed out changeset c9975073c8f9 (bug 1830790)
Backed out changeset 5ff45519f3c3 (bug 1830790)
Backed out changeset 74501c08f8e8 (bug 1830790)
Backed out changeset 174a610b9939 (bug 1830790)
Backed out changeset 7d67775baf45 (bug 1830790)
Backed out changeset f47f4c459184 (bug 1830790)
Backed out changeset 18e95d0700f7 (bug 1830790)
Backed out changeset de2dbc8d5e2a (bug 1830790)
Backed out changeset 887be68cd83e (bug 1830790)

Bug 1648545: Part 4 - Move ContentPage.spawn to use SpecialPowers rather than ContentTask. r=ahal,cookie-reviewers,anti-tracking-reviewers,timhuang

Differential Revision: https://phabricator.services.mozilla.com/D119451

Bug 1648545: Part 2 - Load SpecialPowers in XPCShellContentUtils. r=ahal,application-update-reviewers,nalexander,devtools-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D119449

Depends on D176858

Differential Revision: https://phabricator.services.mozilla.com/D176859